Anti-corrosion and/or passivation compositions for metal containing substrates and methods for making, enhancing, and applying the same

ABSTRACT

A corrosion inhibition composition is disclosed comprising a cerium, a silicate compound, and a molybdate compound. Moreover, a corrosion inhibition composition is disclosed comprising a cerium, a silicate compound, a tungstate and a molybdate compound.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to and is a nonprovisional applicationof U.S. Provisional Patent Application Ser. No. 61/971,993 entitled“‘Smart release’ anti-corrosion pigment compositions and preparationmethods for Zn—Ni coated metal substrates” and filed on Mar. 28, 2014,the contents of which are hereby incorporated by reference in theirentirety.

BACKGROUND

Conventionally, high-performance post-treatments for electroplatingmetal and metal coated substrates (e.g., zinc-nickel coatings on highstrength low alloy steel) are currently based on hexavalent chromatechemistry. Hexavalent chromium is highly toxic and a known carcinogen.Therefore, an alternative to chromate post-treatment may be beneficial.

SUMMARY

Various compositions, systems, and methods are disclosed herein. Invarious embodiments, a corrosion inhibition composition is disclosedcomprising a cerium, a silicate compound, and a molybdate compound. Invarious embodiments, a corrosion inhibition composition is disclosedcomprising a cerium, a tungstate, a silicate compound and a molybdatecompound. In various embodiments, a corrosion inhibition composition isdisclosed comprising a cerium and a molybdate compound. In variousembodiments, a corrosion inhibition composition is provided comprising azinc oxide, a zinc hydroxide benzoate, a sodium benzoate, a molybdateand a silicate compound. In various embodiments, a corrosion inhibitioncomposition is provided comprising a zinc oxide, a zinc phosphate, acalcium silicate, an aluminum phosphate, a zinc calcium strontiumaluminum orthophosphate silicate hydrate, a molybdate, and a silicatecompound.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B illustrate a corrosion inhibition composition coated onsubstrates in accordance with various embodiments;

FIG. 2 illustrates inhibition data of various materials, including thoseof corrosion inhibition compositions in accordance with variousembodiments;

FIG. 3 illustrates potentiodynamic scans of various materials, includingthose of corrosion inhibition compositions in accordance with variousembodiments;

FIG. 4 illustrates potentiodynamic scans of various materials, includingthose of corrosion inhibition compositions in accordance with variousembodiments;

FIG. 5 illustrates potentiodynamic scans of various materials, includingthose of corrosion inhibition compositions in accordance with variousembodiments; and

FIG. 6 illustrates a method of application of corrosion inhibitioncompositions in accordance with various embodiments.

DETAILED DESCRIPTION

All ranges and ratio limits disclosed herein may be combined. It is tobe understood that unless specifically stated otherwise, references to“a,” “an,” and/or “the” may include one or more than one and thatreference to an item in the singular may also include the item in theplural.

The detailed description of exemplary embodiments herein makes referenceto the accompanying drawings, which show exemplary embodiments by way ofillustration and its best mode, and not of limitation. While theseexemplary embodiments are described in sufficient detail to enable thoseskilled in the art to practice the invention, it should be understoodthat other embodiments may be realized and that logical, chemical andmechanical changes may be made without departing from the spirit andscope of the invention. For example, the steps recited in any of themethod or process descriptions may be executed in any order and are notnecessarily limited to the order presented. Moreover, many of thefunctions or steps may be outsourced to or performed by one or morethird parties. Furthermore, any reference to singular includes pluralembodiments, and any reference to more than one component or step mayinclude a singular embodiment or step. Also, any reference to attached,fixed, connected or the like may include permanent, removable,temporary, partial, full and/or any other possible attachment option.Additionally, any reference to without contact (or similar phrases) mayalso include reduced contact or minimal contact.

Corrosion inhibition compositions used on metal and metal coatedsubstrates are important to many industries. For example, aircraftlanding gear often contain metal coated substrates in landing gear andother components, such as bushings. Metal coated substrates are alsoused in other contexts, such as in other vehicles such automobiles,trains, and heavy equipment. In addition, metal coated substrates arefound in construction contexts.

As used herein, a “substrate” may include any metal and/or metal coatedmaterial. For example, a substrate may comprise iron, coated iron,steel, coated steel, stainless steel, coated stainless steel, nickel,coated nickel, aluminum, coated aluminum, bronze, coated bronze, andcopper beryllium, coated copper beryllium, zinc and/or coated zinc. Invarious embodiments, stainless steel may comprise a high strengthstainless steel such as 15-5PH. In various embodiments, a substrate maycomprise a chromium-nickel-tungsten martensitic alloy (also known asGreek Ascoloy). In various embodiments, steel may comprise a highstrength low-alloy steel such as 4340 or 300M. In various embodiments, asubstrate may comprise a metal that is coated with another material. Acoating may be applied by electroplating, cold spraying or othersuitable methods. Coatings may comprise one or more metals, such asnickel (Ni), zinc (Zn), cadmium (Cd), titanium (Ti) and combinationsthereof. For example, in various embodiments, a substrate may comprise acoated low alloy steel (e.g., 300M steel) comprising a Zn—Ni coating. Invarious embodiments, a substrate may comprise a coated steel comprisinga Cd and/or a TiCd coating, optionally chromate conversion top-coatedovercoat. In various embodiments, a substrate may comprise a zinc alloyand/or a TCP (trivalent chromium process (Trivalent Cr coating process)coated zinc alloy. In various embodiments, a substrate may comprise baresteel and/or bare stainless steel. In various embodiments, a substratemay comprise aluminum-nickel-bronze alloys and/or copper alloys. Invarious embodiments, a substrate may comprise aluminum and aluminumalloys.

White rust is a form of corrosion product that may affect substratescomprising zinc. For example, white rust may affect bare zinc and/ormetals coated with zinc containing materials, such as Zn—Ni coated orplated steel, since the former functions as a sacrificial coating thatprotects a steel substrate from corroding. Exposure to water and carbondioxide may cause zinc oxide and/or zinc hydroxide to form, which may bereferred to as white rust, eventually leaving the steel substrateunprotected against corrosion. To aid in preventing this form ofcorrosion and/or to promote surface passivation, among other things, itmay be beneficial to coat a substrate with a corrosion inhibitioncomposition. This corrosion inhibiting composition may also protect thesubstrate at scratched or damaged areas, and/or areas where thesacrificial coating has failed.

A corrosion inhibition composition may comprise one or more materialsthat inhibit at least one form of corrosion of a substrate and/orpromote surface passivation of a substrate. In various embodiments, acorrosion inhibition composition may comprise one of more constituentspecies that may be referred to as pigments or corrosion inhibitionconstituents. In various embodiments, the corrosion inhibitionconstituents may combine in a synergistic manner to help preventcorrosion of a substrate and/or promote surface passivation of asubstrate.

A corrosion inhibition composition may be mixed with an applicationvehicle to aid the application of the corrosion inhibition compositionto a substrate. An application vehicle may be one or more materials thataid in the dispersing and/or application of a corrosion inhibitioncomposition to a substrate. For example, an application vehicle maycomprise an organic resin matrix. In various embodiments, organic resinmatrices used as application vehicles include one or more of an epoxy, apolyurethane, an alkyd, a polysulfide, a silicone, an acrylic, orbutadiene. In that regard, the corrosion inhibition composition, and/ora smart release adjunct, as described herein, may be referred to as acorrosion inhibition organic coating.

As further described herein, the efficacy of the use of molybdates ascorrosion inhibition constituents is related to the solubility ofmolybdate. The higher solubility, the better inhibition molybdates tendto offer. However, using a high solubility of molybdate in corrosioninhibition organic coatings may produce other issues in corrosioninhibition organic coating application, such as formation of blistering,or a lack of long-term corrosion protection performance. In addition, itis beneficial for a corrosion inhibition organic coating to have apoorly soluble corrosion inhibition composition. Thus, a sparinglysoluble corrosion inhibition composition may be beneficial. For example,in accordance with various embodiments, a corrosion inhibitioncomposition may have a solubility of between 0.1 and 20 millimolar (mM)(where 1 mM=10⁻³ mol/L), between 0.5 mM and 15 mM, and between 1 mM and10 mM.

In that regard, a smart release adjunct may be used to enhance molybdatesolubility in corrosion inhibition compositions that contain molybdate.A smart release adjunct may be any material that regulates thesolubility of molybdate.

In various embodiments, a corrosion inhibition composition may regulatethe corrosion current of a substrate in sodium chloride solution tovalues at or below those achieved with a saturated strontium chromatesolution, with or without the presence of dissolved oxygen. In addition,a corrosion inhibition composition may maintain an open circuitpotential (OCP) relationship of steel greater than Cd, TiCd, and platedZn alloys and/or maintain a corrosion current of Cd, TiCd and Zn alloyplating greater than steel. The present inventors have found thatsubstances such as silicate, molybdate and tungstate compounds tend toinhibit corrosion while elevating the open circuit potential of metalsto differing degrees. The present inventors have also found thatcompounds such as rare earth metal cations, zinc phosphate and benzoatecompounds inhibit corrosion while depressing the open circuit potential.In addition, corrosion inhibition compositions and corrosion inhibitionorganic coatings, in accordance with various embodiments, tend topreserve the galvanic relationship between zinc nickel and steel, wherezinc nickel is sacrificial to steel, where the substrate is steel coatedwith (e.g., plated with) zinc nickel.

A corrosion inhibition composition may, in various embodiments, comprisea cerium, a silicate compound, and a molybdate compound. As used herein,a molybdate is a compound that contains an oxide of molybdenum. Invarious embodiments, the molybdate compound is ZnMoO₄ and/or CaMoO₄. Invarious embodiments, the cerium comprises between 10% and 90% by weight(% wt) of the corrosion inhibition composition. As used herein, the term“% wt” or “% by weight,” used in reference to a corrosion inhibitioncomposition, may refer to the percentage weight of a corrosioninhibition constituent or a group of corrosion inhibition constituentsover the weight of the entire corrosion inhibition composition. For theavoidance of doubt, the weight of the entire corrosion inhibitioncomposition in % wt does not include the weight of any applicationvehicle and/or smart release adjunct used in a corrosion inhibitionorganic coating. In various embodiments, molybdate compound (e.g.,ZnMoO₄) comprises between 10% and 90% by weight of the corrosioninhibition composition. In various embodiments, the cerium comprises 50%by weight of the corrosion inhibition composition and the molybdatecompound (e.g., ZnMoO₄) comprises 50% by weight of the corrosioninhibition composition. A corrosion inhibition composition may, invarious embodiments, comprise a cerium and a molybdate compound. In avarious embodiments, cerium and molybdate compounds each comprise 50% byweight of the corrosion inhibition composition.

A corrosion inhibition composition may, in various embodiments, comprisea cerium, a tungstate, a molybdate, and a silicate compound. As usedherein, a tungstate is a compound that contains an oxide of tungsten. Invarious embodiments, the molybdate compound is at least one of ZnMoO₄,CaMoO₄, or MgMoO₄. In various embodiments, the silicate compound is atleast one of MgSiO₃, ZnSiO₃, or CaSiO₃. In various embodiments, thecerium and the tungstate, collectively or individually, comprise between10% and 90% by weight of the corrosion inhibition composition. Invarious embodiments, molybdate compound (e.g., ZnMoO₄) comprises between10% and 90% by weight of the corrosion inhibition composition. Invarious embodiments, the silicate compound (e.g., MgSiO₃) comprisesbetween 10% and 90% by weight of the corrosion inhibition composition.In various embodiments, the cerium and/or the tungstate, collectively orindividually, comprise 33% by weight of the corrosion inhibitioncomposition, the molybdate (e.g., ZnMoO₄) compound comprises 33% byweight of the corrosion inhibition composition and the silicate (e.g.,MgSiO₃) compound comprises 33% by weight of the corrosion inhibitioncomposition. In various embodiments, the cerium, the molybdabate and thesilicate each comprise 33% by weight of the corrosion inhibitioncomposition.

A corrosion inhibition composition may, in various embodiments, comprisea zinc oxide, a zinc hydroxide benzoate, a sodium benzoate, a molybdateand a silicate compound. In various embodiments, the molybdate compoundis ZnMoO₄, CaMoO₄, or MgMoO₄. In various embodiments, the silicatecompound is at least one of MgSiO₃, ZnSiO₃, or CaSiO₃. In variousembodiments, the zinc oxide, the zinc hydroxide benzoate, and the sodiumbenzoate, collectively, comprise between 10% and 90% by weight of thecorrosion inhibition composition. In various embodiments, molybdatecompound comprises between 10% and 90% by weight of the corrosioninhibition composition. In various embodiments, the silicate compoundcomprises between 10% and 90% by weight of the corrosion inhibitioncomposition. In various embodiments, the zinc oxide, the zinc hydroxidebenzoate, and the sodium benzoate, collectively, comprise 33% by weightof the corrosion inhibition composition, the molybdate compoundcomprises 33% by weight of the corrosion inhibition composition and thesilicate compound comprises 33% by weight of the corrosion inhibitioncomposition.

A corrosion inhibition composition may, in various embodiments, comprisea zinc oxide, a zinc phosphate, a calcium silicate, an aluminumphosphate, a zinc calcium strontium aluminum orthophosphate silicatehydrate, a molybdate, and a silicate compound. In various embodiments,the molybdate compound is ZnMoO₄, CaMoO₄, or MgMoO₄. In variousembodiments, the silicate compound is at least one of MgSiO₃, ZnSiO₃, orCaSiO₃. In various embodiments, the zinc oxide, the zinc phosphate, thecalcium silicate, the aluminum phosphate, and the zinc calcium strontiumaluminum orthophosphate silicate hydrate, collectively, comprise between10% and 90% by weight of the corrosion inhibition composition. Invarious embodiments, molybdate compound comprises between 10% and 90% byweight of the corrosion inhibition composition. In various embodiments,the silicate compound comprises between 10% and 90% by weight of thecorrosion inhibition composition. In various embodiments, zinc oxide,the zinc phosphate, the calcium silicate, the aluminum phosphate, andthe zinc calcium strontium aluminum orthophosphate silicate hydrate,collectively, comprise 33% by weight of the corrosion inhibitioncomposition, the molybdate compound comprises 33% by weight of thecorrosion inhibition composition and the silicate compound comprises 33%by weight of the corrosion inhibition composition.

With reference to FIG. 1A, substrate 102 is shown coated with corrosioninhibition composition 104. With reference to FIG. 1B, substrate 150 isshown having coating 152. Coating 152 may comprise Zn and Ni. Substrate150 is also shown coated with corrosion inhibition composition 154.

Surprisingly, certain corrosion inhibition compositions demonstrated asynergetic effect. With reference to FIG. 2, results of a screening testare shown. Testing was performed on a number of corrosion inhibitioncompositions. Corrosion current between substrate electrodes of the samesize was measured in the inhibited electrolyte under an externallyimposed potential difference ranging between larger than 0 mV and 200mV. Corrosion inhibition compositions were screened for inhibition bycomparing steady state corrosion current at inhibitor saturation levelin a typical electrolyte (e.g. 3500 ppm NaCl) versus the un-inhibitedelectrolyte control and the chromated inhibitor baseline (e.g. SrCrO₄).

The x axis of FIG. 2 shows the type of corrosion inhibition compositiontested. Each corrosion inhibition composition tested was tested onTCP-ZnNi-plated steel (left bar) and ZnNi-plated steel (right bar). They axis shows the current measured in μA. As shown, a compositionconsisting of a molybdate compound and a silicate compound is shown ascorrosion inhibition composition 202. A composition consisting of a zincoxide, a zinc hydroxide benzoate, and a sodium benzoate is shown ascomposition 204. A composition comprising a zinc oxide, a zinc hydroxidebenzoate, a sodium benzoate, a molybdate and a silicate compound isshown as composition 206. As illustrated, the current exhibited bycomposition 206 is lower than what would have been expected byadditively combining composition 202 and composition 204.

Also as shown, a composition comprising a cerium, a molybdate and asilicate compound is shown as composition 208.

Inhibition level measurements were taken over TCP/ZnNi-plated steel,ZnNi-plated steel, bare steel, and CCC/Cd-plated steel substrates. Thebelow table summarizes the results in TABLE 1.

TABLE 1 Icorrosion and Igalvanic (μA/ cm²) for different SubstratesPigment Blend Formulation TCP/ Bare CCC/ (equal wt parts each) ZnNi ZnNiSteel Cd cerium and molybdate 0.06 0.2-0.3 1-2 4-5 ~0 1-2 — 6-7 cerium,molybdate and silicate 0.04-0.05 0.1-0.2 3-4 6-7 1-2 5-6 — ~20 zincoxide, zinc hydroxide benzoate, 0.03-0.04 0.6-0.7 1-2 5-6 sodiumbenzoate, molybdate and ~2 5-6 — ~20 silicate zinc oxide, zincphosphate, calcium 0.03-0.04 0.7-0.8 1-2 5-6 silicate, aluminumphosphate, zinc 0.1-0.2 2-3 —  8-10 calcium strontium aluminumorthophosphate silicate hydrate, molybdate and silicate StrontiumChromate (baseline) 0.05 0.1-0.2 1-2  7-10 3-4 ~0.5 — ~10 3500 ppm NaCl(control) 0.2 0.4  8-10 8-9 ~70 ~20 — ~40

As shown, all corrosion inhibition compositions exhibited similarcorrosion rates and similar or lower galvanic corrosion rates comparedto strontium chromate on TCP/ZnNi-plated steel substrate, and comparablerates on uncoated ZnNi-plated steel substrate. On CCC/Cd-plated steelsubstrate all shown corrosion inhibition compositions exhibited similaror comparable corrosion and galvanic corrosion rates compared tostrontium chromate. Finally, on bare steel all shown corrosioninhibition compositions exhibited similar corrosion rates compared tostrontium chromate. As shown, the corrosion current of the corrosioninhibition compositions is less than or about 0.06 μA/cm² on a TCPZnNi-plated steel substrate in 3500 ppm NaCl in water

With reference to FIG. 3, potentiodynamic scans are shown. As shown,there is a synergistic effect of combining a rare earth metal compoundwith at least one of a silicate or a molybdate compounds. An exemplarymixture of a cerium is available commercially under the trademarkECOTUFF from United Technologies Corporation and shown in FIG. 3.

With reference to FIG. 4, potentiodynamic scans are shown. As shown,there is a synergistic effect of combining zinc oxide, a zinc hydroxidebenzoate, and a sodium benzoate with at least one of a silicate or amolybdate compounds.

With reference to FIG. 5, potentiodynamic scans are shown. As shown,there is a synergistic effect of combining the zinc oxide, the zincphosphate, the calcium silicate, the aluminum phosphate, and the zinccalcium strontium aluminum orthophosphate silicate hydrate with at leastone of a silicate or a molybdate compounds.

As described above, one or more smart release adjuncts may be used in acorrosion inhibition organic coating. The smart release adjunct aids inthe solubility of the corrosion inhibition composition.

In various embodiments, a complexing agent (e.g., nicotinic acid or asalt of nicotinic acid) is used as smart release adjunct to increase thesolubility of CaMoO₄/CaSiO₃ pigments.

In various embodiments, an anion (e.g., the oxalate anion C₂O₄ ²⁻ ofMgC₂O₄ ²⁻) is used as smart release adjunct to react with a targetedcation (e.g, Ca²⁺), forming the lower solubility CaC₂O₄ thus increasingthe solubility of CaMoO₄/CaSiO₃ pigments. In various embodiments, atungstate WO₄ ²⁻ (e.g. Na₂WO₄ or CaWO₄) is combined with SrMoO₄ pigmentforming the lower solubility SrWO₄ thus increasing the solubility ofSrMoO₄.

In various embodiments, MgSiO₃ combined with ZnMoO₄ is used as smartrelease adjunct with a corrosion inhibition composition that has a highpercentage by weight of MoO₄ ²⁻.

With reference to FIG. 6, method 600 is illustrated. In step 602, one ormore smart release adjuncts may be combined with a corrosion inhibitioncomposition and an application vehicle (e.g. organic resin matrix) toform a corrosion inhibition organic coating. In step 604, corrosioninhibition organic coating may be painted or otherwise distributed on asubstrate and allowed to dry. For example, a corrosion inhibitionorganic coating may be applied using a brush and/or roller. A corrosioninhibition organic coating may also be applied by dipping or byspraying. Spraying may involve a pump style paint application system,with or without the use of air, to spray the corrosion inhibitionorganic coating onto the substrate. In various embodiments, spraying mayinvolve the use of a propellant, such as a volatile hydrocarbon, topressurize the corrosion inhibition organic coating and propel thecorrosion inhibition organic coating onto the substrate. Step 604 may berepeated one or more times to build one or more layers onto thesubstrate.

Systems, methods and computer program products are provided. In thedetailed description herein, references to “various embodiments”, “oneembodiment”, “an embodiment”, “an example embodiment”, etc., indicatethat the embodiment described may include a particular feature,structure, or characteristic, but every embodiment may not necessarilyinclude the particular feature, structure, or characteristic. Moreover,such phrases are not necessarily referring to the same embodiment.Further, when a particular feature, structure, or characteristic isdescribed in connection with an embodiment, it is submitted that it iswithin the knowledge of one skilled in the art to affect such feature,structure, or characteristic in connection with other embodimentswhether or not explicitly described. After reading the description, itwill be apparent to one skilled in the relevant art(s) how to implementthe disclosure in alternative embodiments.

Benefits, other advantages, and solutions to problems have beendescribed herein with regard to specific embodiments. However, thebenefits, advantages, solutions to problems, and any elements that maycause any benefit, advantage, or solution to occur or become morepronounced are not to be construed as critical, required, or essentialfeatures or elements of the invention. The scope of the invention isaccordingly to be limited by nothing other than the appended claims, inwhich reference to an element in the singular is not intended to mean“one and only one” unless explicitly so stated, but rather “one ormore.” Moreover, where a phrase similar to “at least one of A, B, or C”is used in the claims, it is intended that the phrase be interpreted tomean that A alone may be present in an embodiment, B alone may bepresent in an embodiment, C alone may be present in an embodiment, orthat any combination of the elements A, B and C may be present in asingle embodiment; for example, A and B, A and C, B and C, or A and Band C. Furthermore, no element, component, or method step in the presentdisclosure is intended to be dedicated to the public regardless ofwhether the element, component, or method step is explicitly recited inthe claims. No claim element herein is to be construed under theprovisions of 35 U.S.C. 112(f) unless the element is expressly recitedusing the phrase “means for.” As used herein, the terms “comprises”,“comprising”, or any other variation thereof, are intended to cover anon-exclusive inclusion, such that a process, method, article, orapparatus that comprises a list of elements does not include only thoseelements but may include other elements not expressly listed or inherentto such process, method, article, or apparatus.

The invention claimed is:
 1. A corrosion inhibition compositioncomprising a cerium material, a silicate compound, a molybdate compound,and a tungstate, wherein the molybdate compound is at least one ofZnMoO₄, CaMoO₄ and MgMoO₄.
 2. The corrosion inhibition composition ofclaim 1, wherein the cerium material and the tungstate are present in acombined amount of between 10% and 90% by weight of the corrosioninhibition composition.
 3. The corrosion inhibition composition of claim1, wherein the silicate compound is present in an amount of between 10%and 90% by weight of the corrosion inhibition composition.
 4. Thecorrosion inhibition composition of claim 1, wherein the molybdatecompound is present in an amount of between 10% and 90% by weight of thecorrosion inhibition composition.
 5. The corrosion inhibitioncomposition of claim 1, wherein the molybdate compound is present in anamount of 33% by weight of the corrosion inhibition composition, thesilicate compound is present in an amount of 33% by weight of thecorrosion inhibition composition, and the cerium material and thetungstate are present in a combined amount of 33% by weight of thecorrosion inhibition composition.
 6. The corrosion inhibitioncomposition of claim 1, wherein the silicate compound is at least one ofMgSiO₃, ZnSiO₃ and CaSiO₃.
 7. The corrosion inhibition composition ofclaim 1, wherein the corrosion inhibition composition exhibits acorrosion current of less than or about 0.06 μA/cm² on a trivalentchromium process (“TCP”) ZnNi-plated steel substrate in water containing3500 ppm NaCl.
 8. The corrosion inhibition composition of claim 1,wherein the corrosion inhibition composition exhibits a corrosioncurrent on steel substrates in water containing 3500 ppm NaCl that iscomparable to the corrosion current exhibited by a saturated strontiumchromate composition on steel substrates in water containing 3500 ppmNaCl.
 9. A coating composition comprising the corrosion inhibitioncomposition of claim 1 combined with an application vehicle, wherein theapplication vehicle comprises at least one of an epoxy, a polyurethane,an alkyd, a polysulfide, a silicone, an acrylic, and butadiene.
 10. Thecoating composition of claim 9 further comprising a smart releaseadjunct comprising at least one of nicotinic acid, a salt of nicotinicacid, MgC₂O₄, Na₂WO₄, CaWO₄, and a mixture of MgSiO₃ and ZnMoO₄.
 11. Anaircraft landing gear component coated with the corrosion inhibitioncomposition of claim
 1. 12. A corrosion inhibition compositioncomprising a cerium material, a silicate compound, and a molybdatecompound, wherein the molybdate compound is present in an amount of 33%by weight of the corrosion inhibition composition, the silicate compoundis present in an amount of 33% by weight of the corrosion inhibitioncomposition, and the cerium material is present in an amount of 33% byweight of the corrosion inhibition composition.
 13. The corrosioninhibition composition of claim 12, wherein the molybdate compound is atleast one of ZnMoO₄, CaMoO₄ and MgMoO₄.
 14. The corrosion inhibitioncomposition of claim 12, wherein the silicate compound is at least oneof MgSiO₃, ZnSiO₃ and CaSiO₃.
 15. The corrosion inhibition compositionof claim 12, wherein the corrosion inhibition composition exhibits acorrosion current of less than or about 0.06 μA/cm² on a trivalentchromium process (“TCP”) ZnNi-plated steel substrate in water containing3500 ppm NaCl.
 16. The corrosion inhibition composition of claim 12,wherein the corrosion inhibition composition exhibits a corrosioncurrent on steel substrates in water containing 3500 ppm NaCl that iscomparable to the corrosion current exhibited by a saturated strontiumchromate composition on steel substrates in water containing 3500 ppmNaCl.
 17. A coating composition comprising the corrosion inhibitioncomposition of claim 12 combined with an application vehicle, whereinthe application vehicle comprises at least one of an epoxy, apolyurethane, an alkyd, a polysulfide, a silicone, an acrylic, andbutadiene.
 18. The coating composition of claim 17 further comprising asmart release adjunct comprising at least one of nicotinic acid, a saltof nicotinic acid, MgC₂O₄, Na₂WO₄, CaWO₄, and a mixture of MgSiO₃ andZnMoO₄.
 19. An aircraft landing gear component coated with the corrosioninhibition composition of claim 12.